tree f4b03612a8bae2779a5e02bf2e7d2adfca16a55d
parent b3e8eeb3cbb143f9b663757411ad3442dee34916
author Darrick J. Wong <djwong@kernel.org> 1678161132 -0800
committer Darrick J. Wong <djwong@kernel.org> 1680480814 -0700

xfs: create traced helper to get extra perag references

There are a few places in the XFS codebase where a caller has either an
active or a passive reference to a perag structure and wants to give
a passive reference to some other piece of code.  Btree cursor creation
and inode walks are good examples of this.  Replace the open-coded logic
with a helper to do this.

The new function adds a few safeguards -- it checks that there's at
least one reference to the perag structure passed in, and it records the
refcount bump in the ftrace information.  This makes it much easier to
debug perag refcounting problems.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>